Cap of an injection device



FIG. 1 is a perspective view of an cap of an injection device showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a first side elevation view thereof;

FIG. 5 is a second side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines illustrate boundaries that form no part of the claimed design. 

CLAIM The ornamental design for a cap of an injection device, substantially as shown and described. 